docs: def optimize_thumbnail(thumbnail):
      '''Optimize thumbnail images by removing unnecessary data'''
      try:
          optimize_command = settings.THUMBNAIL_OPTIMIZE_COMMAND[
              determinetype(thumbnail.path)]
          if not optimize_command:
              return
      except (TypeError, KeyError, NotImplementedError):
          return
      storage = thumbnail.storage
      try:
          with NamedTemporaryFile() as temp_file:
              thumbnail.seek(0)
              temp_file.write(thumbnail.read())
              temp_file.flush()
              optimize_command = optimize_command.format(filename=temp_file.name)
              output = check_output(
                  optimize_command, stderr=subprocess.STDOUT, shell=True)
              if output:
                  logger.warning(
                      '{0} returned {1}'.format(optimize_command, output))
              else:
                  logger.info('{0} returned nothing'.format(optimize_command))
              with open(temp_file.name, 'rb') as f:
                  thumbnail.file = ContentFile(f.read())
                  storage.delete(thumbnail.path)
                  storage.save(thumbnail.path, thumbnail)
      except Exception as e:
          logger.error(e)